Astronomy:2MASS J05325346+8246465

From HandWiki
Short description: Star in the constellation Camelopardalis

Coordinates: Sky map 05h 32m 53.46s, +82° 46′ 46.5″

2MASS J05325346+8246465
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  05h 32m 53.46s[1]
Declination +82° 46′ 46.5″[1]
Characteristics
Spectral type L7[1]
Astrometry
Parallax (π)40.2369 ± 0.6389[1] mas
Distance81 ± 1 ly
(24.9 ± 0.4 pc)
Details
Mass0.077–0.085[2] M☉
Temperature1600[3] K
Metallicity [Fe/H]-1.6[3] dex
Age~10[3] Gyr
Other designations
2MASS J05325346+8246465,[1]
2MASS 0532+8246
Database references
SIMBADdata

2MASS J05325346+8246465 (abbreviated 2MASS J0532+8246) is possibly the first brown dwarf observed in the galactic halo of the Milky Way, and the first known substellar subdwarf star.[4][5] It was discovered from Two Micron All-Sky Survey data, and verified by observations at Palomar Observatory and W. M. Keck Observatory.[5] It has a low metallicity, which indicates it is an old star.[5]

The mass and temperature of 2MASS 0532+8246 makes it a rare object in stellar-substellar gap between conventional stars and brown dwarfs.[6] It produces roughly half of its luminosity from hydrogen fusion.[3] Such "gap" objects, covering a narrow range of masses but a wide range of temperatures, and powered by unsteady hydrogen fusion, are exotic but expected to be more common among low-metallicity objects like 2MASS J05325346+8246465.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "2MASS J05325346+8246465 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASS+J05325346%2B8246465&submit=SIMBAD+search. Retrieved 2018-12-04. 
  2. ↑ Burgasser, Adam J.; Kirkpatrick, J. Davy; Burrows, Adam; Liebert, James; Reid, I. Neill; Gizis, John E.; McGovern, Mark R.; Prato, L. et al. (2003). "The First Substellar Subdwarf? Discovery of a Metal‐poor L Dwarf with Halo Kinematics". The Astrophysical Journal 592 (2): 1186–1192. doi:10.1086/375813. Bibcode: 2003ApJ...592.1186B. https://iopscience.iop.org/article/10.1086/375813/fulltext/57859.text.html. 
  3. ↑ 3.0 3.1 3.2 3.3 Allard, F.; Pinfield, D. J.; Zapatero Osorio, M. R.; Lodieu, N.; Gálvez-Ortiz, M. C.; Burgasser, A. J.; Zhang (张曾华), Z. H. (2019), "Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs", Monthly Notices of the Royal Astronomical Society 486: 1260–1282, doi:10.1093/mnras/stz777 
  4. ↑ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J. et al. (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal 752 (1): 56. doi:10.1088/0004-637X/752/1/56. Bibcode: 2012ApJ...752...56F. 
  5. ↑ 5.0 5.1 5.2 Burgasser, Adam J. (2003). "The First Substellar Subdwarf? Discovery of a Metal-Poor L Dwarf with Halo Kinematics.". The Astrophysical Journal 592 (2): 1186–1192. doi:10.1086/375813. Bibcode: 2003ApJ...592.1186B. 
  6. ↑ Zhang 张曾华, Z. H.; Homeier, D.; Pinfield, D. J.; Lodieu, N.; Jones, H. R. A.; Allard, F.; Pavlenko, Ya. V. (2017), "Primeval very low-mass stars and brown dwarfs – II. The most metal-poor substellar object", Monthly Notices of the Royal Astronomical Society 468 (1): 261–271, doi:10.1093/mnras/stx350, Bibcode: 2017MNRAS.468..261Z 
  7. ↑ Schneider, Adam C.; Burgasser, Adam J.; Gerasimov, Roman; Marocco, Federico; Gagné, Jonathan; Goodman, Sam; Beaulieu, Paul; Pendrill, William et al. (2020), "WISEA J041451.67–585456.7 and WISEA J181006.18–101000.5: The First Extreme T-type Subdwarfs?", The Astrophysical Journal 898 (1): 77, doi:10.3847/1538-4357/ab9a40, Bibcode: 2020ApJ...898...77S 

External links




Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:2MASS_J05325346%2B8246465&oldid=3352605"